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How do i select the datafile with the smallest lenght?

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Sam
Sam 2014-12-22
关闭： MATLAB Answer Bot 2021-8-20
I've got a 5x5 matrix (data_stair_rise), and each cell is a struct. Each struct contains a datafile called 'VideoSignals'. I need to select the datafile which has the smallest length. How do I do this?
When I open 'data_stair_rise' it looks like this: data_stair_rise(1, 1). Now there is an overview of datafiles and 'VideoSignals' is one of them.

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回答（2 个）

Image Analyst
Image Analyst 2014-12-22
Why not just use dir() to select the file with the fewest number of bytes in it?
fileInfo = dir(filename);
bytesInFile = fileInfo.bytes;
  2 个评论
Sam
Sam 2014-12-23
fileInfo = dir(data_sts)
Error using dir Function is not defined for 'struct' inputs.
Image Analyst
Image Analyst 2014-12-23
I said to pass it a filename , not a structure, like dir('yourMatFile.mat') or whatever.
Guillaume
Guillaume 2014-12-23
Your question is a bit confusing because you're not using the proper terminology. A structure does not contain datafile. A structure is made of fields.
Length can also have several meaning. Matlab's own length function returns the size of the largest dimension (and thus is best avoided). I'll assume here you want the matrix / vector with least number of elements, so I'll use numel instead.
One way to do what you want:
data1d = data_stair_rise(:); %reshape data_stair_rise as a 1D array to make the rest easier
signallengths = arrayfun(@(elem) numel(elem.VideoSignals), data1d);
[~, idx] = min(signallengths);
smallestsignal = data1d(idx).VideoSignals;

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